Cover Feature: Strengthening of the C−F Bond in Fumaryl Fluoride with Superacids (Chem. Eur. J. 15/2022)

The C−F bond of fumaryl fluoride is strengthened by protonation of the oxygen atom in a sea of superacid. The chain represents the reinforced connection between the carbon atom and the fluorine atom. The C−F bond even reveals a slight double-bond character and a formal positive charge on the fluorine atom. More information can be found in the Research Article by A. J. Kornath, et al. (DOI: 10.1002/chem.202104422).